Hmm...interesting...I've never looked at this report......my guess would be that they are speculating that a disk read takes about 20 ms, so, disk_reads/50 would give you seconds. Same idea for buffer_gets. If a buffer get takes 2 ms, then buffer_gets/500 will yield seconds. As to how accurate that conversion is, well, that depends on way too much stuff to speculate on..... -Mark -- Mark J. Bobak Senior Oracle Architect ProQuest Information & Learning "Exception: Some dividends may be reported as qualified dividends but are not qualified dividends. These include: * Dividends you received on any share of stock that you held for less than 61 days during the 121-day period that began 60 days before the ex-dividend date. The ex-dividend date is the first date following the declaration of a dividend on which the purchaser of a stock is not entitled to receive the next dividend payment. When counting the number of days you held the stock, include the day you disposed of the stock but not the day you acquired it. See the examples below. Also, when counting the number of days you held the stock, you cannot count certain days during which your risk of loss was diminished. See Pub. 550 for more details." --IRS, Form 1040-A Instruction Booklet, Line 9b: Qualified Dividends -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Srikanth Kalluri Sent: Wednesday, March 01, 2006 6:11 PM To: Oracle-L Freelists Subject: RDA - Top SQL report Hi, The question is regarding (Remote Diagnostics Assistant; Metalink Note: 314422.1) Oracle Support provides to troubleshoot performance issues in a database {RDA} and the calculation of the "Top SQL Report" More specifically, I am curious how the following ratios are deemed "Expected Respose Time (in Seconds)" From v$sqlarea: { (disk_reads/executions)/50 } { (buffer_gets/executions)/500 } Also, what is the significance of the numbers 50 and 500 respectively? Queries used in the report: select sql_text, executions, disk_reads / decode(executions,0,1, executions) / 50 from v$sqlarea where disk_reads / decode(executions,0,1, executions) / 50 > 100 order by executions desc; select sql_text, executions, buffer_gets / decode(executions,0,1, executions) / 500 from v$sqlarea where buffer_gets/ decode(executions,0,1, executions) / 500 > 100 order by executions desc; Thanks, Sri -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l